Influence of Ore to Coke Ratio Distribution on Descending and Melting Behavior of Burden in the Blast Furnace

Ichida, Morimasa; Nishihara, Kazuhiro; Tamura, Kenji; Sugata, Masayasu; Ono, Hajime

doi:10.2355/tetsutohagane1955.77.10_1617

Cited by 3 publications

(2 citation statements)

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“…The two important parameters, namely, the gas and solid flow rates, are determined based on the modified Froude number at the throat region of the BF. The modified Froude number, Fr, is represented using Equations (1) and (2) and relates the inertial forces acting on a phase to the gravitational forces for both the solid and gas phases [20]. (1)…”

Section: Methodsmentioning

confidence: 99%

“…Over the past few decades, gas-solid or gassolid-liquid flows in a traditional blast furnace (TBF) have been extensively investigated using physical modelling, which involved two-dimensional (2D) [17][18][19] or three-dimensional (3D) [17,20,21] downscaling BF or COREX models. These studies have led to various findings, which are briefly summarized here.…”

Section: Introductionmentioning

confidence: 99%

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A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

Wang²,

Liu³

et al. 2020

High Temperature Materials and Processes

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The top gas recycling-oxygen blast furnace (TGR-OBF) is a reasonable method used to reduce both coke rate and energy consumption in the steel industry. An important feature of this process is shaft gas injection. This article presents an experimental study on the gas–solid flow characteristics in a TGR-OBF using a two-dimensional cold model. The experimental conditions and parameters were determined using a series of similarity criteria. The results showed that the whole flow area in the TGR-OBF can be divided into four distinct flow zones, namely, the stagnant zone, the plug flow zone in the upper part of the shaft, the converging flow zone and the quasi-stagnant flow zone, which is similar to that in a traditional blast furnace. Then the effects of batch weight and the ratio (X) of the shaft injected gas flow rate to the total gas flow rate on solid flow behaviour were investigated in detail. With the increase in batch weight, the shape of the stagnant zone tends to be shorter and thicker. Furthermore, with the increase in X value from 0 to 1, the stagnant zone gradually becomes thinner and higher. The results obtained from the experiments provide fundamental data and a validation for the discrete element method–computational fluid dynamics-coupled mathematical model for TGR-OBFs for future studies.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

Wang²,

Liu³

et al. 2020

High Temperature Materials and Processes

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DEM-SPH study of molten slag trickle flow in coke bed

Natsui

Sawada

Terui³

et al. 2018

Chemical Engineering Science

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Detailed Modeling of Melt Dripping in Coke Bed by DEM – SPH

et al. 2018

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A high-resolution numerical model was performed for a detailed understanding of packed-bed structures constructed by actual scale cokes, and the molten slag (SiO 2-CaO-Al 2 O 3) trickle flow characteristics in the lower part of an actual blast furnace. Smoothed particle hydrodynamics (SPH) simulations can track the motion of liquids containing dispersed droplets, and the discrete element method (DEM) with a multisphere approach makes possible to simulate non-spherical solid-particle motion. We carried out highresolution large-scale trickle flow simulations using more than 10 million particles, carried out case studies of statistical processing, and evaluated the effects of physical properties varied by the composition or temperature of slag samples. We clarified that there is a limitation to predict the holdup accurately based on the capillary number, which is a widely used approach. We analyzed the influence of melt viscosity on trickle flow, and clarified that an increase in viscosity increases holdup because limiting the effective flow path and suppressing the dispersion of the droplets promoted the enlargement of each stagnant droplet. This detailed direct dynamic model could explain the mechanism underlying different holdup tendencies in conventional research.

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Influence of Ore to Coke Ratio Distribution on Descending and Melting Behavior of Burden in the Blast Furnace

Cited by 3 publications

References 0 publications

A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

DEM-SPH study of molten slag trickle flow in coke bed

Detailed Modeling of Melt Dripping in Coke Bed by DEM – SPH

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